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Projection Welding Electrodes

Luvata is one of the most respected manufacturers of resistance-welding electrodes.

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Our projection welding caps are used to weld nuts, bolts or other fastening assembly to other metal parts.
A-Trode expander header icon

A-Trode® is the universal cap electrode for resistance welding of light-to-medium gauge coated and uncoated steels. 

A-Trode's freedom from oxygen allows us to alloy the copper with the optimum levels of chrome and zirconium.


Alloy: 

  • Copper Chrome Zirconium (CuCrZr)

Quality Specifications

Alloy
C18150 CuCrZr, EN ISO 5182 A2/2, 
DIN 17666 Wn 2.1293, RWMA Class II
Chemical composition
Cr 0.7% to 1.2%, Zr 0.06% to 0.15%. 
Others max. 0.2%, Cu balance
Physical material properties at 200C
Mass:  8.9g/cm3
Specific heat:  376 J/kg.K
Thermal conductivity:  320 W/m.K
Expansion coefficient (20-300oC):  17.0 x 10-6 m/mK
Electric conductivity:  min. 43 S/m
(solution annealed and hardened)  min 74% IACS
Softening temperature:  min. 500°C
Dimensions and tolerances
To ISO 5821 or other standards as required.
Special electrodes to customer drawing
PackagingMost items in cartons of 500 pieces. 
Documentation
Acceptance test certificate EN 10204 3.1 B 
possible if desired against a charge.
Area of application
Male and female resistance welding electrodes. 
Backing dies - series and indirect
Seam welding wheels
Projection welding electrodes 

Mechanical Specifications - Quality

Form of supply
Tensile strength [N/mm2] 
0.2% Offset yield strength [N/mm2] 
Elongation AS [%] 
Hardness 
Electrodes
≥ 490≥ 430≥ 15≥ 172

Physical Properties

Hardness at ambient temperature:Minimum    HRB
Conductivity:Minimum   % IACS

 

Kova expander header icon

Kova® - the 'beryllium-free' alloy made of copper, nickel, silicon and chromium (CuNiSiCr). 

Kova is a high-strength, beryllium-free precipitation hardening alloy with medium-high electrical and thermal conductivity.

Kova is the perfect replacement for harmful beryllium copper alloys.

Benefits:

  • Easy to machine and form
  • Extended use due to hardness
  • High strength with moderate thermal and electrical conductivity
  • Easy disposal

Applications:

  • Adaptors
  • Shanks
  • Projection welding electrodes
  • Weld wheels

Specifications:

Alloy
Kova® NK203 is a RWMA Class III alloy
Chemical composition
Ni 1.8 - 3.0%; Si 0.4 - 0.8%; Cr 0.1 - 0.8%; Fe 0.15% max;. Cu balance
Physical, electrical and thermal properties
Density:  8.8 kg/dm3
Coefficient of linear expansion:  0.0000175 1/K

Specific heat:  380 J/(kg x K)
Melting temperature:  1020 - 1040°C
Electric conductivity:  22 - 24 MS/m
Electrical conductivity (% IACS):  38 - 42%
Electrical resistivity (mass):  0.37 - 0.41 g/m3
Thermal conductivity (20°C):  220 W/Km

Documentation
Acceptance test certificate EN-CEN/TS 13388:2008

Errors and omissions excepted.  Values given are industry standards.

Mechanical Specifications

Form of supplyTensile strength [N/mm2] 0.2% Offset yield strength [N/mm2] Elongation AS [%] Hardness HV
Adapters650-800650-7509-15220-225

Kova by Luvata

 

Nitrode expander header icon
The Nitrode® cap is a cold-formed alloy of dispersion strengthened copper with aluminum oxide. 

Nitrode demonstrates superior weld performance on a variety of steels. It resists mushrooming on the contact surface, allowing more welds before tip dressing, heat stepping or tip change.

No other cap electrode can match Nitrode for its cost-effective, high quality performance in resistance-welding applications.

Nitrode consistently outperforms copper chrome and copper chrome zirconium electrodes by resisting annealing.

Advantages

  • Longer weld life
  • Non-stick
  • Reduces energy requirements
  • Works on all steels
  • Lowers manufacturing costs

Specifications - Quality

AlloyC15760 CuAl2O3 1.1, EN ISO 5182 C20/1, RWMA Class 20
Chemical compositionAluminum 0.60% as Al2O3 1.1%  Cu balance
Physical material properties at 200CMass:  8.81g/cm3
Specific heat:  376 J/kg.K
Thermal conductivity:  322 W/m.K
Expansion coefficient (20-300°C):  16.6 x 10-6 m/mK
Electric conductivity:  min. 45 S/m
Solution-annealed and hardened:  min. 78% IACS
Softening temperature:  1083°C
Dimensions and tolerancesTo ISO 5821 or other standards as required. Special electrodes to customer drawing.
Packaging Most items in cartons of 500 pieces
DocumentationAcceptance test certificate EN 10204 3.1 B possible if desired against a charge.
Area of applicationMale and female resistance welding electrode
Backing dies - series and indirect
Projection welding electrodes

Mechanical Specifications - Quality

Form of supply
Tensile strength [N/mm2] 
0.2% Offset yield strength [N/mm2] 
Elongation AS [%] 
Hardness 
Electrodes
≥ 572≥ 544≥ 5 ≥ 164

 

Physical Properties

Hardness at ambient temperature:Minimum 75 HRB
Conductivity:Minimum 75% IACS

 

Traceability
All materials are fully traceable.  Nitrode® electrodes can be recognized by their single knurls markings.

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